update README with variance feature

add documentation of data-delay-variance option

Add options for delay variance between typestroke

update CDN links, async, headers

use cdn for example

publish to npm

use codepens in playground

document loop

allow camel and snake case in all data

clean up

loop counts by word set

loop the example gif

clarify html over js file for instructions

use let to constrain owners to scope of block and fix wrong-owner bug

refactor string build to handlt HTML entities; use splat to be cool